Abstract
The P-M system of hybrid dysgenesis was investigated in two Japanese regions, Katsunuma and Ohzu. Most strains were Q in that they did not produce appreciable gonadal dysgenesis with P males or with M females. A few strains produced ambiguous results. Some of these were unstable and on later testing were P, Q or M. Eleven laboratory strains which had been derived from various sites in Japan and had been maintained for 8 to 27 years were also examined. Eight (including all four that were 27 years old) were M, two were Q, and one which had been kept as a large cage population showed some P activity.
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Yamamoto, A., Hihara, F. & Watanabe, T.K. Hybrid dysgenesis in Drosophila melanogaster: predominance of Q factor in Japanese populations and its change in the laboratory. Genetica 63, 71–77 (1984). https://doi.org/10.1007/BF00137467
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DOI: https://doi.org/10.1007/BF00137467